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隧道建设(中英文) ›› 2021, Vol. 41 ›› Issue (S1): 181-.DOI: 10.3973/j.issn.2096-4498.2021.S1.023

• 研究与探索 • 上一篇    下一篇

砂卵石地层双线地铁盾构下穿铁路路基变形及地层注浆加固研究

马相峰1, 王立川2 3 4, 龚伦2, *, 陈立保1   

  1. 1. 中铁第四勘察设计院集团有限公司, 湖北 武汉 430063 2. 西南交通大学, 四川 成都 610031;3. 中南大学, 湖南 长沙 410075; 4. 中铁十八局集团有限公司, 天津 300222)

  • 出版日期:2021-07-30 发布日期:2021-08-27
  • 作者简介:马相峰(1993—),男,河南新乡人,2020年毕业于西南交通大学,桥梁与隧道工程专业,硕士,助理工程师,现从事隧道及地下工程的设计研究工作。E-mail: 302750310@qq.com。*通信作者: 龚伦, E-mail: gonglun33@126.com。

Deformation and Grouting Reinforcement for Railway Subgrade Crossed by a DoubleTrack Metro Shield Tunnel in SandyCobble Strata

MA Xiangfeng1, WANG Lichuan2, 3, 4, GONG Lun2, *, CHEN Libao1   

  1. (1.China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 2. Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 3. Central South University, Changsha 410075, Hunan, China; 4. China Railway 18th Bureau Group Co., Ltd., Tianjin 300222, China)

  • Online:2021-07-30 Published:2021-08-27

摘要: 针对砂卵石地层盾构下穿铁路路基工程,通过FLAC 3D数值模拟,结合现场监测数据分析,对路基的变形规律进行研究,基于钢花管地层注浆实践,证明地层注浆加固对控制路基沉降的有效性。主要结论如下: 1)列车运行速度越大、盾构埋深越小,路基沉降越大,但列车速度对路基沉降的影响远小于埋深。2)成都砂卵石地层地铁双线盾构常规净距(约7 m)下穿铁路路基时,路基沉降与埋深、列车速度的近似关系为S=26.54+0.85z0.01v; 由于盾构先后2次施工扰动,路基出现2次位移突降,位移沉降曲线呈台阶状,且二次扰动的地层反应灵敏度快于首次,施工过程应警惕二次扰动造成的位移超标。3)钢花管地层注浆作为一种可操作性强的地层加固方式,在成都砂卵石地区具有良好的加固效果,工程采用“跳孔、分段、多次、中低压”的钢花管注浆方式,路基沉降由11 mm以上降低到7 mm,保障了施工的顺利进行。

关键词: 铁路路基, 盾构下穿, 沉降规律, 地层加固, 钢花管注浆, 砂卵石地层

Abstract: A case study is conducted on a doubletrack metro shield tunnel crossing underneath railway subgrade in sandypebble strata. The deformation law of the subgrade is studied using FLAC 3D numerical simulation based on field monitoring data analysis. The applicable results of ground grouting by steeltube prove the effectiveness of grouting reinforcement in controlling the subgrade settlement. The main conclusions are drawn as follows: (1) The greater the train speed and the smaller the shield burial depth, the greater the subgrade settlement, whereas the influence of train speed on subgrade settlement is far less than that of burial depth. (2) The approximate relationship among the subgrade settlement, the burial depth, and the train speed is S=-26.54+0.85z-0.01v when the doubletrack metro shield undrcrosses the railway subgrade in sandypebble strata in Chengdu with a conventional clear distance of approximately 7 m. Due to the twice disturbance of the shield tunneling, the subgrade has experienced twice sudden drops in displacement, the displacement and settlement curve shows a step shape, and the sensitivity of strata response caused by the second disturbance is faster than that of the first one, as a result, attention should be paid to the displacement caused by the second disturbance. (3) The steel tubegrouting, as a highly operable method for ground reinforcement, has a good reinforcement effect in sandycobble strata in Chengdu. The settlement of subgrade after grouting reinforcement is reduced from over 11 mm to 7 mm, which ensures the smooth and successful shield tunneling.

Key words: railway subgrade, shield undercrossing, settlement law, ground reinforcement, steeltube grouting, sandycobble strata

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